I have a business interface being implemented by two EJBs.
UserManagementService
@Remote public interface UserManagementService {
I got this same exception. In my case I changed my code from @Stateless(mappedName = "whatever") to instead be @Stateless(name = "whatever") and it solved my issue
@Stateless(mappedName = "whatever")
@Stateless(name = "whatever")